How to better position a texture on sides?
If it's a cubic shape like this, I personally don't bother using UVs (unless I have to export it somewhere else where nothing else works).

I instead use Generated texture coordinates, and I change the textures' projection from flat to box:



This way, the texture is projected from a box around the object, you can even use the "Blend" option to blend each face of the box so you don't see much seems: